REFLECTOR: Reflector Digest, Vol 100, Issue 1
Mark Riley
the_rileys1 at verizon.net
Mon Jul 1 12:40:25 CDT 2013
I mounted my unit right behind the panel on two aluminum Angle bar shelf. See blog for detailed pics of the install process. Marksvelocity.blogspot.com
Sent from my iPhone
On Jul 1, 2013, at 12:54 PM, reflector-request at tvbf.org wrote:
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> Today's Topics:
>
> 1. GRT ADAHRS Mounting Location (Scott Baker)
> 2. Re: GRT ADAHRS Mounting Location (Craig Woolston)
> 3. Re: GRT ADAHRS Mounting Location (Glenn Babcock)
> 4. Re: GRT ADAHRS Mounting Location (Michael Watson)
> 5. Re: GRT ADAHRS Mounting Location (Pinkav8or)
> 6. Re: Need for Cabin Heat at Altitude (Rene Dugas)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 01 Jul 2013 07:08:24 -0400
> From: Scott Baker <scottb33333 at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: REFLECTOR: GRT ADAHRS Mounting Location
> Message-ID: <51D16328.9090604 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Question to those flying with GRT EFIS system(s).
> I am soon to install a Grand Rapids dual ADAHRS unit in a fixed gear
> Velocity.
> Avionics shop has installed a 6' cable - enough to mount the ADAHRS in
> the nose compartment, but short of reaching the 'back of the bus' where
> I would typically install the ADAHRS unit.
> Need some feedback please, as to your experiences with mounting the unit
> in the nose compartment. Have there been any concerns/issues regarding
> performance?
> Thanks!
> Scott B.
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 1 Jul 2013 05:47:34 -0700
> From: Craig Woolston <cdwoolston at sbcglobal.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: GRT ADAHRS Mounting Location
> Message-ID: <B5EFF46C-15CB-4C23-852E-EF90753378AE at sbcglobal.net>
> Content-Type: text/plain; charset=us-ascii
>
> Scott,
>
> John and I mounted ours behind panel, above the tunnel. No issues in 6 years and 850 hours. We have the older single but the dual only adds a few inches so I know it will fit because we have looked into upgrading.
>
> Craig
>
> Sent from my iPad
>
> On Jul 1, 2013, at 4:08 AM, Scott Baker <scottb33333 at gmail.com> wrote:
>
>> Question to those flying with GRT EFIS system(s).
>> I am soon to install a Grand Rapids dual ADAHRS unit in a fixed gear Velocity.
>> Avionics shop has installed a 6' cable - enough to mount the ADAHRS in the nose compartment, but short of reaching the 'back of the bus' where I would typically install the ADAHRS unit.
>> Need some feedback please, as to your experiences with mounting the unit in the nose compartment. Have there been any concerns/issues regarding performance?
>> Thanks!
>> Scott B.
>>
>> _______________________________________________
>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
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>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 1 Jul 2013 10:18:19 -0400
> From: Glenn Babcock <glennbabcock at roadrunner.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: GRT ADAHRS Mounting Location
> Message-ID: <F5D32389-DED0-495B-BC62-A76F7245B8DC at roadrunner.com>
> Content-Type: text/plain; charset=us-ascii
>
> Scott,
>
> I mounted mine on the canard under the big hatch, works great there. Just get it level in pitch and roll, and of course orient it towards the direction of flight. I put spacers under the four mounting holes to accomplish this.
>
> I did have some trouble with the magnetometer when it was mounted next to the AHRS so I just moved it to the strake end. Originally when I calibrated it there was a lot of error, and in flight the displayed heading (on the EFIS screens) would sometimes be far off. There is far less error when calibrating it while its mounted in the strake. Now when I display the setup page to access the raw magnetic heading and transmit I do see some deviation, but I haven't flown with it there yet. The Nav lights and strobes do not affect it there.
>
> I probably had the same issue with it on the canard since it was located near the radio stack and didn't see any variation in the displayed heading (on the EFIS screens, not the setup page). I put it in the strake opposite from the side with the Com antenna used by my primary Com radio to minimize the affect, but there is still some deviation in the raw magnetic heading. I'll post back after flying with it there.
>
> Regards,
>
> Glenn
>
>
>
> On Jul 1, 2013, at 7:08 AM, Scott Baker <scottb33333 at gmail.com> wrote:
>
>> Question to those flying with GRT EFIS system(s).
>> I am soon to install a Grand Rapids dual ADAHRS unit in a fixed gear Velocity.
>> Avionics shop has installed a 6' cable - enough to mount the ADAHRS in the nose compartment, but short of reaching the 'back of the bus' where I would typically install the ADAHRS unit.
>> Need some feedback please, as to your experiences with mounting the unit in the nose compartment. Have there been any concerns/issues regarding performance?
>> Thanks!
>> Scott B.
>>
>> _______________________________________________
>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery! www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 1 Jul 2013 11:09:17 -0400
> From: Michael Watson <mikewatsspg at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: GRT ADAHRS Mounting Location
> Message-ID:
> <CAPgogjOEYdy3EJK_2Nv4AJE6PKeWd9cp_qr8S5SDiycEyoR2Gg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Scott,
>
> My single ADAHRS unit is mounted on the top LEFT side of the canard under
> the RBH. The magnetometer is mounted
> in the forward end of the left strake. Works flawlessly six years so far.
> Just make sure you do not place and
> metal objects in the strake pocket behind the door.
>
> Mike W.
>
>
> On Mon, Jul 1, 2013 at 7:08 AM, Scott Baker <scottb33333 at gmail.com> wrote:
>
>> Question to those flying with GRT EFIS system(s).
>> I am soon to install a Grand Rapids dual ADAHRS unit in a fixed gear
>> Velocity.
>> Avionics shop has installed a 6' cable - enough to mount the ADAHRS in the
>> nose compartment, but short of reaching the 'back of the bus' where I would
>> typically install the ADAHRS unit.
>> Need some feedback please, as to your experiences with mounting the unit
>> in the nose compartment. Have there been any concerns/issues regarding
>> performance?
>> Thanks!
>> Scott B.
>>
>> ______________________________**_________________
>> To change your email address, visit http://www.tvbf.org/mailman/**
>> listinfo/reflector <http://www.tvbf.org/mailman/listinfo/reflector>
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>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
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> ------------------------------
>
> Message: 5
> Date: Mon, 1 Jul 2013 11:27:45 -0400
> From: Pinkav8or <pinkav8or at aol.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: GRT ADAHRS Mounting Location
> Message-ID: <CD1395D8-FC35-4852-97DC-E932D112D6DA at aol.com>
> Content-Type: text/plain; charset=us-ascii
>
> I installed mine on the canard,works great
> Ray Watkins
> N222RW
>
> Sent from my iPad
>
> On Jul 1, 2013, at 7:08 AM, Scott Baker <scottb33333 at gmail.com> wrote:
>
>> Question to those flying with GRT EFIS system(s).
>> I am soon to install a Grand Rapids dual ADAHRS unit in a fixed gear Velocity.
>> Avionics shop has installed a 6' cable - enough to mount the ADAHRS in the nose compartment, but short of reaching the 'back of the bus' where I would typically install the ADAHRS unit.
>> Need some feedback please, as to your experiences with mounting the unit in the nose compartment. Have there been any concerns/issues regarding performance?
>> Thanks!
>> Scott B.
>>
>> _______________________________________________
>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery! www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 1 Jul 2013 11:53:14 -0500
> From: Rene Dugas <renedugas at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Need for Cabin Heat at Altitude
> Message-ID: <46D4999B-5F54-4F8D-B9CA-5A0AE9DCEF66 at gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Except Death Valley.
> ? 124 degrees today
>
> Sent from Rene's iPad. A pleasure. Go Apple.
>
>
> On Jun 30, 2013, at 10:45 PM, Brian Michalk <michalk at awpi.com> wrote:
>
>> Thanks for the information.
>>
>> By the way, I am currently separating my oil lines, as suggested by Scott, I believe.
>> I flew on Saturday in 104F heat. CHT's were manageable, but the oil temp was not. This was the first test after capping off my second parallel oil cooler. Results were better than previous.
>> If the split oil lines do not get me the cooling I need, then I'll probably install the fan and reconnect the second oil cooler. If that still fails, then I will try ventilating my ducts to turn them into coolers too.
>>
>> If I can get this to work in 105F weather, I will be able to fly anywhere. Density altitude at my 600' airport was 3500'. Incredible.
>>
>> On 06/30/2013 05:07 PM, Ruben Creus wrote:
>>> It took approximately 10min.. Note that the oil temp is read at the engine block, so assume that cooling the cooler only cools a small amount if oil at a time and then heats when running back into the engine? so the cooling effect needs a bit of time to really cool down the oil as a whole.
>>>
>>> When reached 195F I left it there for another 10 min and it did not change, but you could see the temp going back and forth to 194 ? 195.
>>>
>>> When I did this same test in the winter with a temporary set up, the OAT was 15C instead of 35C, and I was able to get the oil go down to 185F. So ground cooling PASS!! I will report this next winter about the heat in the air, but as I said, I just tried it in the air this week and it was blowing a very decent amount if air in the cabin, and definitely very hot? I had to turn it off as I was cooking myself there. So I have high hopes, but until the real test happens all is a hypothesis, a very good one though?.
>>>
>>> About the fan, yes it was the Jabsco 105CFM. They have more powerful models but I could not find a place to fit it. Also from reading about heat comments last year, it looks like the speed of the air going through the radiator is a factor, the slower the hotter it gets. So, more CFM might give you more air but less hot?.So I figure it our that if the 105CFM give enough air then the slower the better. I guess in a perfect world. There will be different point of speed/temp with different models? but we do not live in a perfect world!
>>>
>>> Ruben
>>>
>>> From: Brian Michalk [mailto:michalk at awpi.com]
>>> Sent: Friday, June 28, 2013 10:27 AM
>>> To: Velocity Aircraft Owners and Builders list
>>> Subject: Re: REFLECTOR: Need for Cabin Heat at Altitude
>>>
>>> Okay, that does look just like the Jabsco blower that we found.
>>>
>>> How long did it take to bring your oil temps down to 195F, and did you stop taking data at that point, or did it stabilize there?
>>>
>>>
>>>
>>> On 6/28/2013 8:05 AM, Ruben Creus wrote:
>>>> I sent this message was it was not posted, so here goes again? see if this time works.
>>>>
>>>> Here I attach some pics. As you can see the flap opens and closes that naca scoop. As the fan is pointing at a 90 degree angle in relation to the oil cooler you need to create a perfect seal, so the naca scoop becomes a chamber where air gets pressurized and the only escape is the oil cooler.
>>>>
>>>> In my tests I noticed that if the chamber is not a perfect seal, then and air escapes, if the air escapes then there is I no pressure built up, and therefore no air going to the cooler, but when the chamber is sealed then all the air builds up and can only go to the cooler. The other test I did was with a normal blower fan, and it losses a lot of CFMs vs. de squirrel cage fan that loses very little CFM. You can see that on the fan manufactures specs. Someone wrote a nice message explaining the difference and the reason for this. What I found out that the propeller design does not move much air when it has pressure in front of it, but with the squirrel cage each blade pushes air to the next and so forth? I am not fan engineer, but in practical terms it was a huge and extremely noticeable difference. I guess that is why they use squirrel cage fan for all ducting systems (like A/C) use squirrel fan, and open air systems use normal fan propellers.
>>>>
>>>> I did a test yesterday. OAT was 35C (95F). I started the engine and the oil go up to 215F, then close the flap and turn the fan on and oil temp when down to 195F, allowing me to stay in the ground for as much time we want. (very convenient in large airports).
>>>>
>>>> The other tests was in flight to close the flap and open the fan, and I had a very decent amount of air going to the cabin, pretty hot air!! So very promising. Now I just need to wait until the winter to give a final verdict, but the amount of air is very decent and the temperature was very hot. So we will see what happens in the winter months.?.
>>>>
>>>> I hope this is helpful and not too boring.
>>>>
>>>> Ruben
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>>>
>>>> Visit the gallery! www.tvbf.org/gallery
>>>> user:pw = tvbf:jamaicangoose
>>>> Check new archives: www.tvbf.org/pipermail
>>>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>>
>>>
>>>
>>> _______________________________________________
>>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>>
>>> Visit the gallery! www.tvbf.org/gallery
>>> user:pw = tvbf:jamaicangoose
>>> Check new archives: www.tvbf.org/pipermail
>>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>
>> _______________________________________________
>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
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